// 云函数入口文件
const cloud = require('wx-server-sdk')

cloud.init()

const db = cloud.database()
// 云函数入口函数
exports.main = async (event, context) => {
  const match = {_id: event.id}
  const wxContext = cloud.getWXContext()
  try{
    return await db.collection('discuss').aggregate()
    .lookup({
      from: 'remark',
      localField: '_id',
      foreignField: 'tid',
      as: 'remarkList'
    })
    .match(match)
    .end()
    .then(function(res){
      return res
    })
  }catch(err)
  {
    console.log(err)
  }

}